Checkerwork brick



. De 14,1926. I 1,610,575

H. MO LL CHEOKER WORK BRICK I Filed April 6, 1.925 2 Sheets-Sheet l E E5 v CL Dec. 14, 1926.

H. MOLL CHECKER WORK BRICK Filed April 6 1925 2 Sheets-Sheet 2 Patented Dec. 14,1926.

UNITED STATES PATENT OFFICE.

HERMANN MOLL, OF RASSELSTEIN, GERMANY.

CHECKERWORK BRICK.

Application filed April 6, 1925, Serial No. 21,016, and in Germany April 7, 1924.

This invention relates to a checker work of hollow bricks of rectangular cross section for regenerators, air heaters and similar heat accumulators. The bricks have continuous hollows and they are placed in rows so that their small sides are in contact, the hollows stand vertical and the rows ofv bricks are at a certain distance from one another. The rows in the superposed courses alternate so that the superposed rows of bricks cross one another.\ At the points of intersection the bricks lay one upon the other with the full ends, as the hollows in the bricks are of such dimensions that the thickness of the wall of each brick at the small side is equal to half the width of the brick. In this manner a checker work is produced which has interrupted passages extending from the top to the bottom and at the points of intersection strong pillars are formed which extend over the entire height of the checker work 1 and are connected with one another by the thin side walls of the bricks.

In the checker work constructed according to the invention the hot gases flow around all sides of the entire brick material so that it is' at a high degree capable of absorbing heat.

The bricks for building the checker work may be of other shape as stated above, the small sides of the bricks which come in contact with one another being rounded in outward direction. Owing to this shape wedge-shaped apertures or slots are formed between the bricks and serve as passages for the flames. The long sides which form the connecting webs may also be ,bulged out whereby the heating surface is considerably increased and the free cross section of the bricks enlarged, so that clogging of the passages is retarded or prevented. Owing to the rounded small sides at which the bricks are joined when the checker considerably facilitated and. wages economized. The bricks possess, notwithstanding the rounded small sides suflicient contacting surface so that the stability of the checker work is not impaired as the continuous vertical pillars extend over the entire height of the checker work and are connected with one another by the curved webs formed by the bricks.

Several embodiments of the invention are shown, by way of example, in the accompanymg drawings, in which Fig. 1 shows the checker work in elevation and section.

Fig. 2 is a plan view of the grid work.

F g. 3 shows a brick in perspective view.

Fig. 4: shows in perspective View a brick focf checker work made with rounded small si es.

Fig. 5 is a plan View of bricks as illustrated in Fig. 4.

Fig. 6 shows in perspective view a brick with rounded small sides.

Fig. 7 shows in plan view a checker work 'made from these bricks.

The checker work is built of bricks a of rectangular cross section which haveqa continuous hollow I). These bricks are laid in rows so that the small sides of the bricks join, the continuous hollows b standing vertical. The rows 0 of bricks are at a certain distance the one from the other. The brick rows d of the next higher course are laid at right angles to the rows 0 .of the lower course as shown in Fig. 2. The end walls 6 of the hollow bricks are of a thick; ness equal to half the height of the bricks wherefrom results that at the points of intersection a full bearing surface is provided for the next higher bricks and the strong pillars f are created which extend over the entire height of the checker work; These pillars f are connected with one another by the thin side walls 9 of the bricksso that a stable and strong checker work is produced. 1

The channels formed by the hollows b of the bricks are interrupted in every course towards both sides so that the hot gases flow around the bricks. on all sides.

The brick shown in Fig. 4, which as a whole is designated by a, has rounded small sides 5 and straight long sides 0 Owin to the rounded small sides 6 wed e-s a-ped slots 6 are formed between the oining end faces of two bricks as shown in Fig. 5 through which the flames can ass.

P The brick a shown in Fig. 6 has not only rounded small sides 6 but also outwardly bulged long sidesc whereby the free cross section of the brick is considerably enlarged. With these bricks wedge-shaped apertures 6 are also formed between the joining bricks so that the hot gases can flow along the head ends of the bricks.

The hollow bricks may be of any desired size. A brick 230 X 125 x 100 mm. has a heated surface of 11,56 sq. cm. so that in a checker work of one m. cube, for which 160 bricks are required, the heating surface is 18,496 sq. m. i

I claim 1. A heat recuperative checker work comprising horizontal courses of hollow bricks, alternate courses crossing one another, each brick having a continuous longitudinal passage therethrough, the ends of bricks of each course arranged in contact throughout their length, whereby the overlapping ends of the bricks in the courses form a continuous column. 1

2. A heat recuperative checker work comprising horizontal alternate courses of hollow bricks, said courses crossing one another, each brick having a continuous passage therethrough, the ends of the bricks of each course arranged vertically in contact and the thickness of the end Walls beingsubstantially half the thickness of a brick, whereby the overlapping ends of the bricks in the course form a continuous vertical column and each side wall of each brick is exposed to gases on both sides.

3. A refractory brick for checker-work, hollow throughout its length and approximately rectangular in longitudinal and transverse directions, the end walls of the brick having a'thickness substantially one half the thickness of the brick.

4:. A refractory brick for checker-work, hollow throughout'its length and approximately rectangular in longitudinal and transverse directions, the end walls of the brick having a thickness substantially one half the thickness of the brick and having curved outer surfaces.

5. A refractory brick for checker work, hollow throughout its length and approximately rectangular in longitudinal and transverse directions, the end walls of the brick having a thickness substantially one half the thickness of the brick, and the side walls of the brick being slightly curved.

6. A hollow refractory brick for checker work in which the joining ends of the bricks are free of projections and rounded on their outer faces.

In testimony that I claim the foregoing as my invention, I have signed my name.

HERMANN MOLL. 

